Unsaturated esters and sulphates thereof



Patented May 4, 1937 UNITED STATES PATENT OFFICE v UNSATURATED ESTERS AND SULPHATES THEREOF Y No Drawing. Application July 18, 1932, Serial No. 623,298. In Germany July 17, 1931 4 Claims.

(Granted under the provisions of sec. 14 act of March 2, 1927; 357 0. G. 5)

It is well-known that by conversion of technical oil and fatty acids with low-molecular alco- I hols, such as methyl, ethyl-, and isopropyl-alcohol, artificial fatty acid esters are arrived at which owing to their thin liquid and fatty characteristics represent valuable assistants in the textile industry (of. German Patent No. 388,219).

It has been found that in treating textile fibres and fabrics, some kinds of leather and other similar materials definite particular effects can be achieved, such as could only previously be achieved by the use of natural neats-foot oil if, instead of using the latter use is made of the esters of unsaturated mono-basic fatty acids with rated fatty alcohols with at least 8 carbon atoms. These esters which, for instance, can be obtained by heating suitable fatty acids With the alcohols mentioned with or without catalysts but which 20 are also contained in natural products, have a more or less low coagulation point according to their composition, so that they can be adjusted to suit all technical requirements in use. They can be used as they are or else in a sulphated con- 25 dition, as mentioned above, in the first place for greasing leather, but also for treating animal or vegetable fibres and fabrics. Goods treated become soft and pliable, and leather greased with these esters loses its brittleness and tendency 3 to crack.

The technical advantage of this in comparison with natural neats-foot oil which always has the same chemical composition, lies in the fact that one can combine the fatty acid with the fatty alcohol in any manner desired and so obtain esters possessing considerably more suitable prop erties than natural neats-foot oil. The greasing value is therefore in numerous cases greater.

ular alcohols possess an unpleasant, spirity smell or a typically penetrating ester smell which makes it more difficult to work with such products, the esters here in question are practically 45 odorless.

Example I 282 kilos of oleic acid are esterified in the presence of 15 kilos of concentrated sulphuric acid with 158 kilos of decyl alcohol at about 80-100 high-molecular univalent saturated or unsatu Further, whilst esters formed from lower molec- C. A surplus of fatty alcohol is recommendable as it has a favorable effect on the yield, and on completion of the esterification and if desired, after washing with water, it can be steamed off in a Vacuum.

The ester prepared in the described manner facilitates considerably the weaving of wool, cotton and other fibres and it can also be used to assist in the tearing process in the manufacture of artificial wool. It is recommended that about 10 4-5% of the ester be used for fibres worked according to the carded yarn process, and about 1% for those Worked on the worsted systems.

Example II 282 kilos of physet oleic acid are esterified with 260 kilos of oleyl alcohol. After it has been worked up the ester obtained is sulphated with 140 kilos of concentrated sulphuric acid at 25-30 0., washed with cooking salt or Glaubers salts solution and neutrlized in any way desired.

A sulphated product results which, in a 2-3% solution in water meets the requirements of the leather industry for a leather greaser which resists cold and does not efiioresce, and it obtains better softening effectsthan are obtained with sulphonated natural neats-foot oil which has been treated by the freezing process.

What I claim is:

1. An oil for treating fibrous material which consists principally of esters of p hysetoleic acid and oleyl alcohol.

2. An oil for treating fibrous material which consists principally of sulphated esters of physetoleic acid and alcohol of the group consisting of the unsaturated aliphatic mono-hydric alcohols having 8 or more carbon atoms in the molecule.

3. An oil for treating fibrous materials which consists principally of sulphated esters of physetoleic acid and oleyl alcohol. 7

4. An oil for greasing fibrous materials which consists principally of a material selected from the group consisting of the esters of physetoleic acid and aliphatic straight chain mono-hydric alcohols having 8 or more carbon atoms in the molecule, and the sulphates of these esters.-

WALTHER SCI-IRAUTH. 

